Corona shield



G. M. RUOFF CORONA SHIELD Feb. 18, 1941.

Filed Aug. 15, 1939 2 Sheets-Sheet l Feb. 18, 1941. .G. M. RUOFF 7 2,232,665

CORONA SHIELD Filed Aug. 15, 1939 2 Sheets-Sheet 2 Patented Feb. 18, 1941 Y UNITED STATES PATENT QtlFlQE CORONA SHIELD George M. Ruofi, Baltimore, Md, assignor to Locke Insulator Corporation, Baltimore, Md, a corporation of Maryland Application August 15, 1939, Serial No. 296,288

2 Claims. (Cl. 174-144) The invention relates to corona shields and horns and grading shields are spaced above the more particularly to corona shields in connection associated clamps they cannot and do not effecwith strain and suspension clamps. tively control corona discharges from the clamp The principal object of my invention, generally proper, and it is the purpose and object of this considered, is to provide a shielding member invention to provide a shield which can be po- 5 adapted to be secured to a clamp and to surround sitioned adjacent the clamp, the shield lying subthe clamp body so as to suppress corona charges stantially in the plane of the clamp, the body of from the sharp projecting portions of the clamp the shield being arranged substantially parallel structure. to the plane of the conductor and extending both Still another object of the invention is to proabove and below the body of the clamp so as to vide a corona shield which may be readily and prevent corona discharge from any portion of conveniently formed from stock material having the clamp and in this manner silence the clamp a continuous body portion in loop form, the opso far as radio noises are concerned.

r posite end of the loop being flattened and per- Referring now to the drawings, the numeral I fo ated t receive t securing ea designates a corona shield which may be and To these and other ends the invention relates preferably is formed as a loop 2 having the end to various modifications of the construction shown portions thereof flattened, as shown at 3, and on the accompanying drawings in which: perforated, as shown at 4, in order that the pivot Figure l. is a side elevational view showing my belt 5, by which the parts of the suspension clamp improved form of corona shield assembly with a 6 are pivotally connected, may be passed through suspension clamp, the latter being illustrated by the ears or flattened portions 3 so as to firmly unite dot and dash lines. the shield to the clamp body. The loop portion is Figure 2 is a top plan view of the shield memadapted to extend both above and below the conr ber shown in Figure l. ductor receiving portion l of the suspension clamp Figure 3 is a side elevational View of a corona and by extending the arms 8 which form the upper shield adapted to be assembled with a strain portion of the loop at an angle to the arm 9 formclamp, the latter being illustrated by dot and big the lower portion of the loop, the shield is dash lines. spaced from the conductor at points where the Figure 4 is a top plan View of the construction arms 8 and the arm 9 merge. The shield being n shown in Figure 3. positioned both above and below the clamp body 00 Throughout the specification and drawings like and being adapted to intersect the plane of the parts are designated by like reference characters. conductor and at the same time is maintained Owing to the constantly increasing use of radio substantially in the plane of the clamp body, ef-

u, receiving sets in all sections of this country it fectively acts to suppress corona discharges and has become of vital importance to provide for thereby silences the clamp and prevents any interthe suppression of noises emanating from transference between this portion of the transmission mission lines. It has been found that one of line and the radio sets. the sources of radio interference in connection As shown in Figures 3 and I use substantially with transmission lines is in the lack of shielding the same means for suppressing corona discharges adjacent the support for the conductor. All from strain clamps and in this embodiment of 40 clamps, whether of the suspension or the strain the invention the corona shield is substantially variety, involve a plurality of nuts and bolts, the triangular in outline, the base It of the triangle sharp edges and corners of which become corona preferably extending substantially parallel to the discharge points. In addition, in suspension clamping portion ll of the strain clamp I2, one clamps it is common to arch the ends of the keeper of the sides of the triangle l3 extending upwardly away from the conductor so as to prevent damage and being provided with a perforated ear I4, the

to the conductor during the oscillation of the other arm l5, for the major portion of its length,

latter and these arched up ends of the keeper also extending parallel to and preferably in contact form corona discharge points. with the upper surface E6 of the clamp. The arm It has been common to provide in connection 15 is connected to the base It by a semi-circular 50 with insulators strings, grading shields and arcportion ll, said portion being spaced above the ing horns, the former acting to equalize the implane of the arm it so that the conductor, at its pressed voltage through the string of insulators point of exit from the upper portion of the clamp, and the latter acting as discharge points for the will not contact the portion ll of the shield. The surges over the conductor. Since both arcing arm 15 is also provided with an ear l3 having an Cit opening therein and the bolt 19 by which the clamp is connected to its support is also adapted to pass through the ears l4 and [8 for maintaining the shield in assembled position with the clamp.

The function and purpose of the shield of Figures 3 and 4 are identical with that of the shield of Figures 1 and 2 and since the latter have been fully described it is not essential to repeat this description for these figures.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. The combination with a high tension line conductor, of a clamp therefor, means for connecting said clamp to one of the series of connected insulators, and a corona shield connected to said clamp, said shield being positioned substantially in a vertical plane passed through the longitudinal axis of said clamp, opposite portions of said shield lying on opposite sides of said con ductor.

2. The combination with a high tension line conductor, of a clamp therefor, means for connecting said clamp to one of a series of connected high tension insulators, and a corona shield comprising a loop member of substantially uniform cross-section, the free ends of said loop being positioned on opposite sides of said clamp and connected thereto, opposite portions of said loop lying on opposite sides of said conductor, the vertical plane passing through said loop being substantially parallel to the vertical plane passing through the longitudinal axis of said clamp.

GEORGE M. RUOFF. 

